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Sometimes when I create a file using vim some/path/newfile, vim lets me edit it, only to complain when I attempt to save my changes.
E212 Can't open file for writing.
This appears to happen only when the new file is located in a system directory.
:w! does not override this error.
How can I write the current buffer, without having to save it to a temporary location, exit, then rename it using sudo?
This will ask you for the root password, then save your changes as you requested:
Then type (L)oad at the prompt, to re-load the file after it is saved.